Modified static example to send appropriate MIME type

Modified the static example in the examples subdirectory
to use the mimetypes application to determine the appropriate
MIME type to send down the wire in the HTTP headers of the reply.

examples/static/rebar.config

@@ -1,4 +1,6 @@
 {deps, [
 	{cowboy, ".*",
-		{git, "git://github.com/extend/cowboy.git", "master"}}
+		{git, "git://github.com/extend/cowboy.git", "master"}},
+	{mimetypes, ".*",
+		{git, "git://github.com/spawngrid/mimetypes.git", "master"}}
 ]}.

examples/static/src/static_app.erl

@@ -14,7 +14,8 @@ start(_Type, _Args) ->
 	Dispatch = [
 		{'_', [
 			{['...'], cowboy_static, [
-				{directory, {priv_dir, static, []}}
+				{directory, {priv_dir, static, []}},
+				{mimetypes, {fun mimetypes:path_to_mimes/2, default}}
 			]} 
 		]}
 	],